Hi, came upon a few references to Boville/Bovell/Borel and wonder if perhaps you should be checking in county Antrim as well.
Wills:
Aghavarry, county Antrim
Betty Bovell died: 13 January 1879
Culnafey,county Antrim
George Bovill died: 10 August 1877
executors: William John & James Bovill of Ardnaglass, county Antrim
mentioned in will are brother-William and sisters- Mary & Nancy also Robert Jr, James Jr & Charles Bovill (doesn't specify relationship to George)
1831 Antrim-townland Culnaveigh George Bovill
1680 census-Antrim mention of Steven Bovell
In Freeholders' lists is Thomas Bovell-Culanavea Grange, Antrim
also in Court Cheque Book (listing voters for 2 knights to represent county Antrim) dated 1 June 1776 is also listed Thomas Bovell
Found a Samuel Borel listed in the 1831 county Derry census living in Lisnagrot with 6 in household, 3 males & 3 females, all belonging to the established church.
Kim